ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari

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Refraction Through Lenses (Solved)

Question .1. An object is placed in front of a lens between its optical cenre and the focus. The image formed is virtual, erect and diminished .

(i) Name the lens which forms this image.

(ii) Draw a ray diagram to show the formation of an image with the above characteristics.

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Question .2. An object AB is placed on the principal axis of a convex lens as shown in figure below. Copy the diagram. Using three rays starting from B and the properties of the points marked F1, O and F2 obtain the image formed by the lens.

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Question .3. Figure below shows an object AB placed on the principal axis of a convex lens placed in air. F1 and F2 are the two foci of the lens. Copy the diagram :

(i) Draw a ray of light starting from B and passing through O. Show the same ray after refraction by the lens.

(ii) Draw another ray from B which passes through F2 after refraction by the lens.

(iii) Locate the final image formed.

(iv) Is the image formed real and inverted ?

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Question .4. Is it possible to burn a piece of paper using a convex lens in day light without using matches or any direct flame ? Draw a ray diagram to illustrate your answer.

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Question .5. Figure below shows an object AB placed on the principal axis of a lens L. The two foci of the lens are F1 and F2. The image formed by the lens is erect, virtual and diminished. Copy the diagram and answer the following questions :

(i) Draw the outline of lens L used.

(ii) Draw a ray from B, and passing through O. Show the ray after refraction by the lens.

(iii) Draw a ray of light starting from B, which after passing parallel to the principal axis, is incident on the lens and emerges after refraction from it. 

(iv) Locate the final image formed.   

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Question .6. Write the name of the

(i) most sensitive and

(ii) most insensitive part of the retina.

   
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Question .7. Draw a ray diagram to illustrate the action of a convergent lens as reading glasses or magnifying glass.

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Question .8. In an optical camera, state

(i) the nature of lens used

(ii) what is meant by f-number

(iii) two characteristics of the image formed by the lens.

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Question .9. An erect, diminished and virtual image is formed when an object is placed between the optical centre and the principal focus of a lens.

(i) Name the type of lens, which forms the above image.

(ii) Draw a ray diagram to show the formation of the image with the above characteristics.

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Question .10. State two similarities between the photographic camera and the human eye.

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Question .11. Name any two essential parts of a single lens photographic camera.

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Question .12. A ray of light after refraction through a concave lens emerges parallel to the principal axis. Draw a ray diagram to show the incident ray and its corresponding emergent ray. 

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Question .13. State the characteristics of the image of an extended source, formed by a concave lens. 

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Question .14. The diagram given below shows an object O and its image I. Copy the diagram and draw suitable rays to locate the lens and its focus. Name the type of lens in this case. 

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Question .15. An object is placed in front of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.

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Question .16.  Mention one similarity and one difference between the lens of a photographic camera and that of the human eye.

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Question .17. Draw outline ray diagram to show the formation of images through an eye in the following cases :

(i) from a distance object for a short-sighted person and  

(ii) from the normal point of distinct vision for a long –sighted person.

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Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]